“…We examined the studies with the 10 highest (Bolao and Ramon, 1995; Des Jarlais et al, 2009b; Des Jarlais et al, 2010; Des Jarlais et al, 1999; Diaz et al, 2001; Dourado et al, 1999; Mesquita et al, 2001; Neaigus et al, 1996; Platt et al, 2008; Zhang et al, 2002) and 10 lowest log ORs (Boschini et al, 1996; Des Jarlais et al, 2007a; Helal et al, 1995; Jia et al, 2008; McIntyre et al, 2001; Quan et al, 2009; Serraino et al, 1992; Yin et al, 2007; Zhang et al, 2007a; Zheng et al, 1994) to possibly identify factors associated with extreme values. The potential factors examined included sexual behavior, use of non-injected drugs such as crack cocaine, participation in commercial sex work, male-with-male sexual behavior, stigmatization of females and access to services.…”